js数组的问题

Question

没什么函数，只有循环遍历。Array基本的方法如下：
concat
join
pop
push
reverse
shift
slice
sort
splice
unshift

Answer 1

var test = ["test1","test2","test3","test4","test5"];
var judgeID=3;
if (test[judgeID]='test3')
return true;

Answer 2

var test = ["test1","test2","test3","test4","test5"];
var judgeID=2;
if (test[judgeID]='test3')
return true;

Answer 3

<script type="text/javascript">
<!--
   test = ["test1","test2","test3","test4","test5"];
   function returnArrSub(arrObj,judgeStr){
       var n=0;
   for (var i=0;i<arrObj.length;i++){
       if (arrObj[i] == judgeStr){
       return n +=1;
   }
   else{
       n++;
   }
   }
   return "nothing"; //如果都没则返回nothing
   }
   alert(returnArrSub(test,"test3"));
//-->
</script>